The audibility of a whisper depends on several factors, including the loudness of the whisper, background noise, and the sensitivity of the listener's ears. However, as a general guideline, it is commonly understood that a typical human whisper can be heard clearly at a distance of about 1-3 meters (3-10 feet) in a quiet environment.
Beyond this distance, the sound of a whisper tends to become increasingly faint and may be difficult to understand or hear clearly. Factors such as environmental noise, the direction of the sound, and any obstacles or barriers between the speaker and listener can further affect audibility.
It's worth noting that this distance can vary based on individual hearing abilities, the specific context, and the volume or intensity of the whisper. In noisy or crowded environments, it may be even more challenging to hear a whisper clearly, and the effective range could be significantly reduced.